No matter what you might have heard to the contrary, physicians are not supposed to heal themselves, but must call on their fellow practitioners to treat them. Realtors need not follow the same restriction, and many do list their own dwellings for sale.

This benefits the buyers, since the professionals are likely to know which features are most likely to provide both pleasure for their own families and resale profit for their future clients, when they acquire and improve their homes.

A realtor since 1977, Dianna Campagna kept both comfort and profit firmly in mind when she expanded the second story of her 84-year-old colonial house. Its library boasts a panoramic city and river view, from a curved wall of 16-foot windows with a window seat. The room also features dramatic slanted ceilings, hardwood floors, built-in bookshelves and an adjoining bath. Another bath and two bedrooms are located at the top of the front stairs.

The stairs lead down to the front entrance hall, beyond the pillared portico. On either side of the foyer, the study and the living room display crown molding, while the living room also features a fireplace. Behind the living room, the dining room adjoins the kitchen that leads to the porch, with its multipaned windows. The front study adjoins the office-sunroom, which provides a patio entrance and nearby powder room.

Hardwood floors continue throughout this level, in addition to the tiled kitchen and powder room. The lower level provides another office, a workshop and a door leading outside.

Since it is less than a mile from both Whole Foods on Duke Street and the King Street Metro station, this house also features the big three advantages of any home for sale location, location and location.